"I do know my dad did his best to do right (and conduct real science — the two were closely linked for him) and that he disapproved of the unethical acts he witnessed. Hence his willingness to be vocal on the subject a few years later," his son wrote.

In 1975, the Army admitted that it had administered LSD to nearly 1,500 people between 1956 and 1967, including 585 at Edgewood.

Dr. Klee later led the unsuccessful effort to persuade President Richard M. Nixon to renounce the use of LSD as a chemical weapon.

Gerald D'Arcy Klee was born and raised in Bay Ridge in Brooklyn, N.Y., and was a 1944 graduate of Fort Hamilton High School. He enlisted in the Army and served in Paris with the Office of Liquidation until being discharged in 1946.

After earning a bachelor's degree in 1948 from McGill University, he graduated in 1952 from Harvard Medical School.

He interned from 1952 to 1953 at the U.S. Public Health Hospital on Staten Island, N.Y., and from 1954 to 1956 completed a residency in psychiatry at the Johns Hopkins University and the Veterans Hospital at Perry Point.

From 1959 to 1967, he was director of the Division of Adult Outpatient Psychiatry at the University of Maryland, and served in a similar capacity at Temple University from 1967 to 1970.

Dr. Klee also was a medical educator who taught at the University of Maryland, Temple and Hopkins. He also maintained a private practice until retiring in 2000.

His interests included the Chesapeake Bay, art and music. He enjoyed swimming and reading, especially in the fields of mythology and classical literature.

Funeral services will be held at 11 a.m. Friday at the Collins Funeral Home, 500 University Blvd. W, Silver Spring.

In addition to his son, Dr. Klee is survived by another son, Brian D. Klee of Waterford, Conn.; three daughters, Susan E. Klee of Chevy Chase, Louise E. Klee of Takoma Park and Sheila G. Klee of New York City; a brother, Raymond Klee of Innsbruck, Austria; and 11 grandchildren. His four marriages ended in divorce.